Pileus Git - ~andy/gtk/blob - gtk/gtkcssimagevalue.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include "gtkcssimagevalueprivate.h"
  21
  22 #include "gtkcssimagecrossfadeprivate.h"
  23
  24 struct _GtkCssValue {
  25   GTK_CSS_VALUE_BASE
  26   GtkCssImage *image;
  27 };
  28
  29 static void
  30 gtk_css_value_image_free (GtkCssValue *value)
  31 {
  32   g_object_unref (value->image);
  33   g_slice_free (GtkCssValue, value);
  34 }
  35
  36 static GtkCssValue *
  37 gtk_css_value_image_compute (GtkCssValue        *value,
  38                              guint               property_id,
  39                              GtkStyleContext    *context,
  40                              GtkCssDependencies *dependencies)
  41 {
  42   GtkCssImage *image, *computed;
  43
  44   image = _gtk_css_image_value_get_image (value);
  45
  46   if (image == NULL)
  47     return _gtk_css_value_ref (value);
  48
  49   computed = _gtk_css_image_compute (image, property_id, context, dependencies);
  50
  51   if (computed == image)
  52     {
  53       g_object_unref (computed);
  54       return _gtk_css_value_ref (value);
  55     }
  56
  57   return _gtk_css_image_value_new (computed);
  58 }
  59
  60 static gboolean
  61 gtk_css_value_image_equal (const GtkCssValue *value1,
  62                            const GtkCssValue *value2)
  63 {
  64   return value1->image == value2->image;
  65 }
  66
  67 static GtkCssValue *
  68 gtk_css_value_image_transition (GtkCssValue *start,
  69                                 GtkCssValue *end,
  70                                 guint        property_id,
  71                                 double       progress)
  72 {
  73   GtkCssImage *fade;
  74
  75   fade = _gtk_css_image_cross_fade_new (_gtk_css_image_value_get_image (start),
  76                                         _gtk_css_image_value_get_image (end),
  77                                         progress);
  78
  79   return _gtk_css_image_value_new (fade);
  80 }
  81
  82 static void
  83 gtk_css_value_image_print (const GtkCssValue *value,
  84                            GString           *string)
  85 {
  86   if (value->image)
  87     _gtk_css_image_print (value->image, string);
  88   else
  89     g_string_append (string, "none");
  90 }
  91
  92 static const GtkCssValueClass GTK_CSS_VALUE_IMAGE = {
  93   gtk_css_value_image_free,
  94   gtk_css_value_image_compute,
  95   gtk_css_value_image_equal,
  96   gtk_css_value_image_transition,
  97   gtk_css_value_image_print
  98 };
  99
 100 GtkCssValue *
 101 _gtk_css_image_value_new (GtkCssImage *image)
 102 {
 103   static GtkCssValue none_singleton = { &GTK_CSS_VALUE_IMAGE, 1, NULL };
 104   GtkCssValue *value;
 105
 106   if (image == NULL)
 107     return _gtk_css_value_ref (&none_singleton);
 108
 109   value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_IMAGE);
 110   value->image = image;
 111
 112   return value;
 113 }
 114
 115 GtkCssImage *
 116 _gtk_css_image_value_get_image (const GtkCssValue *value)
 117 {
 118   g_return_val_if_fail (value->class == &GTK_CSS_VALUE_IMAGE, NULL);
 119
 120   return value->image;
 121 }
 122